Product overview
Details that help confirm the fit.
The Siemens LME11 is a microprocessor-based burner control box designed for the automatic start-up, operating supervision and safety shutdown of small and medium-capacity gas burners.
Depending on the complete model and burner configuration, the controller can be used with one-stage or two-stage gas burners operating in intermittent mode. It manages the programmed start-up sequence and supervises components such as the burner fan, ignition transformer, gas valves, air-pressure switch and flame-detection system.
Gas-flame supervision can be performed using an ionisation probe or a compatible Siemens QRA ultraviolet flame detector with the required AGQ3 ancillary unit. The detector type must match the controller version, burner construction and approved wiring diagram.
On applicable forced-draught burner configurations, the controller monitors the air-pressure switch and performs a functional check during start-up and burner operation. If sufficient combustion airflow is not established or maintained, the controller initiates a safety shutdown or lockout.
Digital signal processing provides an accurate and repeatable control sequence. The controller also incorporates undervoltage detection, electrical remote reset and limitation of repeated burner restart attempts.
A multicolour LED provides operating-status and fault information. Diagnostic flash codes help qualified service personnel identify the stage of the operating sequence at which the burner entered lockout.
The LME11 provides controlled intermittent operation by shutting down and restarting the burner after a maximum of 24 hours of continuous operation. This allows the programmed start-up safety checks to be repeated.
The LME control family uses the same housing dimensions as Siemens LGB and LMG burner controls. Physical compatibility alone does not confirm electrical compatibility, so the operating sequence, terminal arrangement, safety timings and flame detector must be verified before replacement.
Typical applications include forced-draught gas burners, commercial boilers, hot-water boilers, steam boilers, industrial ovens, furnaces, hot-air generators and process-heating equipment.
Installation, wiring, flame-detector selection, commissioning and lockout diagnosis must be performed by qualified burner-service personnel. The controller must not be opened, altered, bypassed or repaired.
Model, voltage, rotation, pressure range and mounting can vary. Final compatibility is confirmed against the nameplate or existing component.
